The saying “I could kick myself” means to blame one’s self. It doesn’t involve literal kicking, but there are karate jokes.
   
“I’m kicking myself for not taking up karate earlier.  #pun” was posted on Twitter by mantic59 on June 22, 2010. “Pun of the day is a stinker - I am just kicking myself I did not take up karate earlier” was posted on Twitter by jimiwhitten on June 22, 2010. “I am kicking myself I did not take up karate earlier” was posted on Twitter by brad stefanov on June 22, 2010.
 
“I came last in a karate competition yesterday. I was kicking myself!” was posted on Reddit—Jokes on November 8, 2013. “I was really upset that I came in last at the karate competition yesterday. I was kicking myself” was posted on Reddit—Jokes on January 1, 2020. “My son seemed really upset that he came in last at the Karate competition. He was kicking himself” was posted on Reddit—Dadjokes on March 20, 2020.  “My son was very upset that he came in last at the Karate competition. He was kicking himself” was posted on LaffGaff on May 2, 2023.
   
     
Merriam-Webster Dictionary 
kick oneself idiom
informal
: to blame or criticize oneself for something one has done
 
Cambridge Dictionary
be kicking yourself/could have kicked yourself
phrase
used to say that you are very annoyed with yourself because you have done something stupid or missed a chance:
   
Twitter
mantic59
@mantic59
I’m kicking myself for not taking up karate earlier.  #pun
9:01 AM · Jun 22, 2010
   
Twitter
jimiwhitten
@jimiwhitten
Pun of the day is a stinker - I am just kicking myself I did not take up karate earlier.
11:15 AM · Jun 22, 2010
 
Twitter
brad stefanov
@snicker01
I am kicking myself I did not take up karate earlier.
12:38 PM · Jun 22, 2010
   
Twitter
Benjamin Ranyard
@higgledygarden
I gave up Karate years ago. I’m still kicking myself.
12:33 PM · Jun 22, 2012
 
Twitter 
James Hazelden
@jameshazelden
The guy who lost the karate gold medal must have been kicking himself. #lastchance #alljokesmustgo #olympics
12:12 AM · Aug 13, 2012
 
Reddit—Jokes 
Posted by u/tommex November 8, 2013
I came last in a karate competition yesterday
I was kicking myself!
         
Twitter
Puns of The Day
@RandomPun
I am kicking myself I did not take up karate earlier.
7:30 PM · Nov 25, 2013
   
Twitter
John Nolan
@BigJNol
I am kicking myself I did not take up karate earlier.
1:47 AM · May 10, 2015
   
Twitter
Dominic Henkelman
@DominicHenkelma
I’m kicking myself for not taking those karate lessons
10:30 AM · May 18, 2016
   
Twitter
Colin Wright
@colinwright1959
I’m kicking myself that I didn’t take up karate earlier in my life…
7:46 AM · Jul 31, 2018
 
Reddit—Jokes
Posted by u/porichoygupto January 1, 2020
I was really upset that I came in last at the karate competition yesterday.
I was kicking myself.
 
Reddit—Dadjokes 
Posted by u/porichoygupto March 20, 2020
My son seemed really upset that he came in last at the Karate competition.
He was kicking himself.
     
Twitter
QwazyQuokka
@Girlie4
I can’t believe I came last in the karate competion today.
I was kicking myself. 🙄
8:36 PM · Mar 22, 2020
   
Twitter
Dennis Staples
@gosporttomarlow
I’m kicking myself that I didn’t take up karate earlier.
1:10 PM · Jun 27, 2020
   
Twitter
Rin the Dragon
@RinTheDragon
I am kicking myself I did not take up karate earlier.
6:06 AM · Jan 9, 2021
 
Twitter
Ash 🇬🇧🇺🇦🇺🇸🇨🇦🇩🇰🇮🇸🇮🇱🏉🏍
@FlashMuellerF30
A young lad was really disappointed that he finished last at the local Karate club competition.
He was kicking himself. 😬😬😎😎
2:17 PM · May 14, 2021
   
Twitter
Chu-Let-The-Dogs-Out✊🏾🇪🇺🇬🇧🏳️‍🌈🇺🇦
@Chumantastic
My son was very upset that he came in last at the Karate competition..
He was kicking himself.
#LunchPun
7:00 AM · Nov 17, 2022
 
LaffGaff
Karate Competition
May 2, 2023 by laffgaff
My son was very upset that he came in last at the Karate competition.
He was kicking himself.
 
Twitter
Robert Wilkinson
@robertwlk
I was really upset about coming last in the karate competition.
I was kicking myself.
4:58 AM · May 3, 2023